There were also outgoings from the Emirates Stadium over the course of the past few months.
Here is a look at where all the players who left permanently have gone...
Matteo Guendouzi, Marseille
The midfielder was allowed to leave Arsenal on a permanent basis after four years.
He spent last season on loan at Marseille and they decided to make his move permanent.
Lucas Torreira, Galatasaray
He spent the past couple of campaigns out on loan at Atletico Madrid and Fiorentina after falling down the pecking order.
Galatasaray lured him to Turkey in August and he has since made six Super Lig appearances for the Istanbul giants.
Bernd Leno, Fulham
The goalkeeper lost his place between the sticks to Aaron Ramsdale last term.
Fulham came calling for him after their promotion from the Championship and he has since become their number one.
Konstantinos Mavropanos, Stuttgart
Stuttgart swooped to land him on a contract until 2025 after they stayed up in late May.
He has made Germany his home now after spending two years on loan at the Mercedes-Benz Arena.
Hector Bellerin, Barcelona
The right-back landed a dream move to the Camp Nou and has since made a couple of appearances for the La Liga outfit.
He spent 11 years with the Gunners and played 239 games.
Alexandre Lacazette, Lyon
Arsenal signed the France international from Lyon in 2017 and he has now returned there five years later.
The striker has scored four goals in eight games since his return.
Jonathan Dinzeyi, free agent
The centre-back remains without a club and will be weighing up his next move in the game.
He spent time on loan in League Two at Carlisle United to get some experience earlier this year.
Joel Lopez, Cultural Leonesa
The 20-year-old has returned to Spain and now plays in the Primera Federación for Cultural Leonesa.
That is the equivalent of the third tier.
Jordan McEneff, Derry City
Derry City landed him last month and he has embarked on a new challenge in Ireland.
The midfielder played 21 times for Arsenal U21s during his time in London.